Pesticidal unsymmetrical n-substituted bis-carbamoyloxy disulfide compounds

ABSTRACT

Unsymmetrical N-substituted bis-carbamoyloxy disulfide compounds exhibit outstanding nematocidal, miticidal and insecticidal activity, coupled with substantially reduced mammalian toxicity and phytotoxicity as compared to known pesticidal compounds having a comparable spectrum of activity against insect, arachnid and nematode pests.

This invention relates to unsymmetrical N-substituted bis-carbamoyloximino disulfide compounds and to methods for preparing the same. This invention is also directed to insecticidal, miticidal and nematocidal compositions comprising an acceptable carrier and an insecticidally, miticidally or nematocidally effective amount of a compound according to this invention, as well as to a method of controlling insects, mites and nematodes by subjecting them to an insecticidally, miticidally or nematocidally effective amount of a compound of this invention.

More particularly, this invention relates to compounds of the formula: ##STR1## wherein: R' and R" are the same and are alkyl having from 1 to 4 carbon atoms; R₁ is alkynyl, ##STR2## R₂ is other than R₁ and is:

(A) alkyl, alkenyl or alkynyl; or

(B) dihydrobenzofuranyl, naphthyl, tetrahydronaphthyl, benzothienyl, indanyl, benzodioxalanyl, benzofuranyl, benzodioxanyl all of which may be substituted with one or more alkyl groups; or

(C) either substituted or unsubstituted phenyl wherein the permissible substituents are one or more halo, cyano, nitro, cycloalkyl, alkyl, alkylthio, alkynyl, alkenyl, alkylsulfinyl, alkylsulfonyl, alkylthioalkyl, alkylsulfinylalkyl, alkylsulfonylalkyl, alkynylthio, alkenylthio, amino, alkylamino, dialkylamino, alkoxycarbonylamino, trihalomethyl, dialkylaminoalkyleneamino, formamidino, alkoxy, dicyanoethenylene, alkynyloxy, phenoxy, phenyl, 2-oxathianyl, 2-oxathiolanyl, 2-dithianyl, 2-dithiolanyl, 2-dioxalanyl or 2-dioxanyl; or ##STR3## wherein:

R₃ is hydrogen, alkyl, alkylthio, alkylsulfinyl, alkylsulfonyl or cyano;

R₄ is alkyl, alkylthio, alkylsulfinyl, alkylsulfonyl, alkoxy, alkanoyl, aroyl, alkoxycarbonyl, phenyl, aminocarbonyl, alkylaminocarbonyl or dialkylaminocarbonyl, all of which may be unsubstituted or, except aminocarbonyl, substituted with one or more cyano, nitro, alkylthio, alkylsulfinyl, alkylsulfonyl, alkoxy, aminocarbonyl, alkylaminocarbonyl, dialkylaminocarbonyl or R₄ is a ##STR4## where R₅ is hydrogen, alkyl or alkoxy;

A is a divalent alkylene chain having from 2 to 24 aliphatic carbon atoms completing a five or six membered ring structure which includes one, two or three groups selected from the group consisting of divalent oxygen, sulfur, sulfinyl, sulfonyl, amino, alkylamino, alkylimino or carbonyl groups;

with the proviso that R₂, R₃, R₄ and R₅ substituents individually may not include more than eight aliphatic carbon atoms.

The following miticidally, insecticidally and nematocidally active compounds are illustrative of the compounds of this invention all of which can be conveniently prepared by the process of this invention simply by selecting appropriate starting materials for use in the procedures described below:

N-[1-methylthioacetaldehyde O-(N-methylcarbamoyl)oxime] N-[2-O-(N-methylcarbamoyl)oximino-1,4-dithiane]disulfide

N-[1-methylthioacetaldehyde O-(N-methylcarbamoyl)oxime ] N-[2,3-dihydro-2,2-dimethyl-7-(N-methylcarbamoyloxy) benzofuran] disulfide

N-[1-methylthioacetaldehyde O-(N-methylcarbamoyl)oxime] N-(3-isopropylphenyl N-methylcarbamate) disulfide

N-[1-methylthioacetaldehyde O-(N-methylcarbamoyl)oxime] N-(1-naphthyl N-methylcarbamate) disulfide

N-[2-methylthio-2-methylpropionaldehyde O-(N-methylcarbamoyl)oxime] N-(1-naphthyl N-methylcarbamate)disulfide

N-[1-methylthioacetaldehyde O-(N-methylcarbamoyl)oxime] N-(2-isopropoxyphenyl N-methylcarbamate)disulfide

N-[1-methylthioacetaldehyde O-(N-methylcarbamoyl)oxime] N-(4-dimethylamino-3,5-xylyl N-methylcarbamate) disulfide

N-[2-methylthio-2-methylpropionaldehyde O-(N-methylcarbamoyl) oxime] N-(3-isopropyl-4-methoxycarbonylaminophenyl N-methylcarbamate)disulfide

N-[2-methylthio-2-methylpropionaldehyde O-(N-methylcarbamoyl) oxyme] N-(2,3-dihydro-2,2-dimethyl-7-(N-methylcarbamoyloxy) benzofuran] disulfide

N-[1-methylthio-N',N'-dimethylcarbamoylformaldehyde O-(N-methylcarbamoyl)oxime] N-[1-methylthioacetaldehyde O-(N-methylcarbamoyl)oxime] disulfide

N-[2-methylsulfonyl-2-methylpropionaldehyde O-(N-methylcarbamoyl)oxime] N-[2,3-dihydro-2,2-dimethyl-7-(N-methylcarbamoyloxy) benzofuran] disulfide

N-[2-o-(n-methylcarbamoyl)oximino-1,4-dithiane] N-(3-isopropylphenyl N-methylcarbamate) disulfide

N-[1-methylthioacetaldehyde O-(N-methylcarbamoyl)oxime] N-[4-(N',N'-dimethylformamidino)-3,5-xylyl N-methylcarbamate] disulfide

N-[1-methylthioacetaldehyde O-(N-methylcarbamoyl)oxime] N-[N',N'-dimethylaminomethylenecarbamoyl)-1-methylthioformaldehyde O-(N-methylcarbamoyl-oxime] disulfide

N-[2-methylthio-2-methylpropionaldehyde O-(N-methylcarbamoyl)oxime] N-(4-dimethylamino-3,5-xylyl N-methylcarbamate) disulfide

N-[3,3-dimethyl-1-methylthiobutanone-2-O-(N-methylcarbamoyl)oxime] N-[1-methylthioacetaldehyde O-(N-methylcarbamoyl)oxime] disulfide

N-[3,3-dimethyl-1-methylsulfonylbutanone-2-O-(N-methylcarbamoyl)oxime] N-[2,3-dihydro-2,2-dimethyl-7-(N-methylcarbamoyloxy) benzofuran] disulfide

N-[3-methylsulfonylbutanone-2 O-(N-methylcarbamoyl)oxime] N-[2,3-dihydro-2,2-dimethyl-7-(N-methylcarbamoyloxy) benzofuran] disulfide

N-[3,3-dimethyl-1-methylthiobutanone-2 O-(N-methylcarbamoyl) oxime] N-[1-methylthioacetaldehyde O-(N-methylcarbamoyl) oxime] disulfide

N-[2-cyano-2-methylpropionaldehyde O-(N-methylcarbamoyl) oxime] N-[1-naphthyl N-methylcarbamate] disulfide

N-[1-methylthio-N',N'-dimethylcarbamoylformaldehyde O-(N-methylcarbamoyl)oxime] N-[2,3-dihydro-2,2-dimethyl-7-(N-methylcarbamoyloxy) benzofuran] disulfide

N-[1-methylthiopyruvaldehyde O-(N-methylcarbamoyl)oxime] N-[1-methylthioacetaldehyde O-(N-methylcarbamoyl)oxime] disulfide

N-[2-o-(n-methylcarbamoyl)oximino-1,3-dithiolane] N-(1-naphthyl N-methylcarbamate) disulfide

N-[5-methyl-4 O-(N-methylcarbamoyl)oximino-1,3-dithiolane] N-(1-naphthyl N-methylcarbamate) disulfide

N-[1-(2-cyanoethylthio)acetaldehyde O-(N-methylcarbamoyl) oxime] N-(1-naphthyl N-methylcarbamate) disulfide

N-[1-(2-cyanoethylthio)acetaldehyde O-(N-methylcarbamoyl) oxime] N-[2,3-dihydro-2,2-dimethyl-7-(N-methylcarbamoyloxy) benzofuran] disulfide

N-[4,5,5-trimethyl-2 O-(N-methylcarbamoyl)oximino-thiazolidin-3-one] N-[1-methylthioacetaldehyde O-(N-methylcarbamoyl)oxime] disulfide

N-[4,5,5-trimethyl-2 O-(N-methylcarbamoyl) oximinothiazolidin-3-one] N-[3,5,5-trimethyl-2 O-(N-methylcarbamoyl) oximinothiazolidin-4-one] disulfide

N-[4-methyl-2 O-(N-methylcarbamoyl)oximinotetrahydro-1,4-thiazine-3-one] N-(1-naphthyl N-methylcarbamate)disulfide

N-[4-methyl-2 O-(N-methylcarbamoyl)oximino-tetrahydro-1,4-thiazine-3-one] N-[1-(2-cyanoethylthio)-acetaldehyde O-(N-methylcarbamoyl)oxime] disulfide

N-[4-methyl-2 O-(N-methylcarbamoyl)oximino-tetrahydro-1,4-thiazine-3-one] N-[1-methylthioacetaldehyde O-(N-methylcarbamoyl)oxime] disulfide

N-[5,5-dimethyl-4 O-(N-methylcarbamoyl)oximino 1,3-dithiolane] N-(1-naphthyl N-methylcarbamate) disulfide

N-[2-(o-(n-methylcarbamoyl)oximino-1,4-dithiane)] N-[4-dimethylamino-3,5-xylyl N-methylcarbamate] disulfide

N-[2-(o-(n-methylcarbamoyl)oximino-1,4-dithiane)] N-[3-isopropyl-4-methoxycarbonylamino-(N-methylcarbamoyloxy) benzene] disulfide

N-[1-(2-cyanoethylthio) acetaldehyde O-(N-methylcarbamoyl) oxime] N-[2-(2-dithiolanyl) phenyl N-methylcarbamate] disulfide

N-[1-(2-cyanoethylthio)acetaldehyde O-(N-methylcarbamoyl) oxime] N-[2-(2-dioxalanyl)phenyl-N-methylcarbamate]disulfide

N-[1-isopropylthioacetaldehyde O-(N-methylcarbamoyl)oxime] N-[2-propynyloxy phenyl N-methyl-carbamate] disulfide

N-[2,3-dihydro-2,2-dimethyl-7-benzofuranyl-N-methylcarbamate] N-[propynyl N-methylcarbamate] disulfide

N-[1-(2-cyanoethylthio) acetaldehyde O-(N-methylcarbamoyl) oxime] N-[4-phenoxyphenyl N-methylcarbamate] disulfide

N-[1-methylthio-N',N'-dimethylcarbamoylformaldehyde O-(N-methylcarbamoyl)oxime] N-[2-(2-dithiolanyl) phenyl N-methylcarbamate] disulfide

N-[1-(2-cyanoethylthioacetaldehyde O-[N-methylcarbamoyl) oxime] N-[2-isopropoxyphenyl N-methylcarbamate] disulfide

N-[2-o-(n-methylcarbamoyl)oximino-1,3,5-trithiane] N-[2-isopropoxyphenyl N-methylcarbamate] disulfide

N-[2-o-(n-methylcarbamoyl)oximino-1,3,5-trithiane] N-[2-(2-oxathiolanyl) phenyl N-methylcarbamate] disulfide

N-[2-o-(n-methylcarbamoyl)oximino-1,4-dithiane] N-[2-propynyloxy phenyl N-methylcarbamate] disulfide

N-[5-methyl-4-O-(N-methylcarbamoyl)oximino-1,3-oxathiolane] N-[4-phenoxyphenyl N-methylcarbamate].disulfide

N-[4,5,5-trimethyl-2-O-[N-methylcarbamoyl)oximinothiazolidin-3 one] N-[2-propynyloxyphenyl N-methylcarbamate] disulfide

N-[3,5,5-trimethyl-2-O-[N-methylcarbamoyl]oximinothiazolidin-4-one] N-[2-(2-dithiolanyl)phenyl N-methylcarbamate] disulfide

All of the compounds within the purview of the generic formula set forth above exhibit nematocidal, miticidal and insecticidal activity to a lesser or greater extent. Accordingly, these compounds are extremely useful for the control of insect, nematode and mite pests. Some of these compounds exhibit very high levels of miticidal, nematocidal and insecticidal activity in extremely small dosages while others require larger dosages to be effective. They also exhibit excellent leaf and soil residual activity.

In general, the compounds of this invention are either totally lacking in phytotoxicity or exhibit only minimal phytotoxicity with respect to economically important crop species. In addition, these compounds exhibit substantially reduced levels of mammalian toxicity as compared to known pesticidal compounds having a comparable spectrum of activity against insect, arachnid and nematode pests.

Preferred because of their higher levels of miticidal, insecticidal and nematocidal activity are the compounds of this invention in which:

R' and R are methyl;

R₁ is alkynyl, ##STR5##

R₂ is other than R₁ and is:

(A) alkyl, alkenyl or alkynyl

(B) naphthyl, dihydrobenzofuranyl, benzothienyl or tetrahydronaphthyl, all of which may be substituted with one or more alkyl groups;

(C) phenyl or phenyl substituted with one or more alkyl, dialkylamino, alkoxycarbonylamino, dialkylaminoalkyleneimino, alkoxy, alkynyloxy, alkylthio or halo; or ##STR6## wherein;

R₃ is hydrogen, alkyl, alkylthio, or cyano

R₄ is alkyl, nitroalkyl, alkylthio, alkylsulfinyl, alkylsulfonyl, alkylthioalkyl, alkylsulfinylalkyl, alkylsulfonylalkyl, cyanoalkylthio, cyanoalkylsulfinyl, or cyanoalkylsulfonyl;

A is a divalent alkylene chain having from 2 to 24 aliphatic carbon atoms completing a 2-oximino-1,4-dithiane, 2-oximino-1,3-dithiane, 4-oximino-1,3-dithiolane, 2-oximino-1,4-dioxane, 2-oximino tetrahydro-1,4-thiazine-3-one, 2-oximino-1,3-dithiolane, 2-imino-4-oximino-1,3-dithiolane, 3-oximinothiophane, 2-oximinothiophane, 2-oximino-tetrahydro-1,4-oxazin-3-one, 2-oximino-1,3,5-trithiane, 4-oximino-1,3,5-oxathiane, 2-oximino-1,4-oxathiane, 4-oximino-1,3-oxathiolane, 2-oximino-thiazolidin-3-one, 2-oximino-1,3-thiazolidin-4-one or 2-oximinotetrahydro-1,4-thiazine-5-one ring structure, wherein sulfur may be in any of its oxidation states.

The unsymmetrical bis-carbamate compounds of this invention can be prepared by a variety of methods. One preferred method is illustrated by the reaction scheme set forth below in which R', R", R₁ and R₂ are described above: ##STR7##

METHOD I is a two-step reaction sequence which can be conducted in-situ or the carbamate-thiosulfenyl carbamoyl halide intermediate (II) of Step A can be isolated and used as the reactant of Step B at some latter time. In Step A, one equivalent of an appropriately substituted hydroxyl reactant, either R₁ OH or R₂ OH, is reacted with one equivalent of the bis-(N-alkyl-N-fluorocarbonylamino) disulfide reactant (I), in presence of at least one equivalent of an acid acceptor, preferably in an aprotic solvent to yield the intermediate carbamate-thiosulfenyl carbamoyl halide (II). In Step B an equivalent of the intermediate carbamate-thiosulfenyl carbamoyl halide (II) reactant is then reacted with a second equivalent of a hydroxyl reactant, R₂ OH if R₁ OH was used as the reactant of Step A. Step B is also conducted in the presence of at least one equivalent of an appropriate acid acceptor and in an aprotic solvent, to yield the desired unsymmetrical bis-carbamate compound (III).

Normally an aprotic organic solvent is employed as the reaction medium. Illustrative of aprotic organic solvents which are suitable as reaction solvents in the practice of the preferred embodiments of this invention are saturated and unsaturated aliphatic and aromatic hydrocarbons, e.g. hexane, cyclohexane, octane, dodecane, naphtha, decalin, kerosene, tetrahydronapthalene, cycloheptane, alkylcycloalkane, benzene, toluene, xylene, naphthalene, alkylnapthalene, or the like, ethers such as tetrahydrofuran, tetrahydropyran, diethyl ether, dioxane, 1,2-dimethoxybenzene, 1,2-ethoxybenzene, the mono and dialkyl ethers of ethylene glycol, of dipropylene glycol, of butylene glycol, or diethylene glycol, of dipropylene glycol, or chlorinated aliphatic hydrocarbons as for example, chloroform, dichloromethane, 1,1-dichloroethane, carbon tetrachloride or the like.

The acid acceptor utilized in the conduct of the reaction of METHOD I may be either an organic or inorganic base. Illustrative of organic bases that are useful as acid acceptors are tertiary amines, alkali metal alkoxides or the like. Bases such as sodium hydroxide, potassium hydroxide or the like are illustrative of inorganic bases which are useful in the conduct of this reaction. Preferred acid acceptors are aromatic and aliphatic tertiary amines, such as triethylamine, pyridine, trimethylamine, 1,4-diazabicyclo [2.2.2] octane and the like.

When an inorganic base is used as the acid acceptor, phase transfer agents may be used to facilitate the transfer of the acid acceptor across the organic/inorganic phase interface. Illustrative of useful phase transfer agents are crown ether compounds, quaternary ammonium halide compounds or the like.

The reaction temperature is not critical and can be varied over a wide range. The reaction is preferably conducted at a temperature of from about -30° C. and upwards to approximately 120° C. Particularly preferred reaction temperatures are from about 0° C. to about 75° C.

Reaction pressures are not critical. The process can be conducted at either subatmospheric, atmospheric or superatmospheric pressure. For convenience the reaction is usually conducted at atmospheric or autogeneous pressure.

Compounds of this invention in which R₃, R₄ or A includes a sulfinyl or sulfonyl moiety can be conveniently prepared by the selective oxidation of the sulfide linkage of the corresponding thio compound at an appropriate point in the synthetic procedure. For example, N-[2-methylsulfonyl-2-methylpropionaldehyde O-(N-methylcarbamoyl) oxime] N-[2,3-dihydro-2,2-dimethyl-7-(N-methylcarbamoyloxy)benzofuran] disulfide can be conveniently prepared either by selectively oxidising 2-methylthio-2-methylpropionaldoxime with peracetic acid prior to carbamoylation or by selectively oxidising N-[2-methylthio-2-methylpropionaldehyde O-(N-methylcarbamoyl)oxime] N-[2,3-dihydro 2,2-dimethyl-7-(N-methylcarbamoyloxy) benzofuran] disulfide subsequent to carbamoylation,

Oxime precursors of the formula: ##STR8## in which R₂ and R₃ are described above, can be conveniently prepared according to a variety of methods. For example, 2-methylthio-2 methylpropionaldoxime can be prepared by chlorinating 2-methylpropanal to form 2-chloro-2-methylpropanal which is then treated with sodium methylmerceptide to form 2-methylthio-2-methyl-propanal. 2-Methylthio-2-methyl-propanal is then treated with hydroxylamine hydrochloride to form the desired oxime precursor. The above disclosed method together with other methods useful for preparing oxime precursors are described in more detail in the U.S. Pat. Nos. 3,843,669; 3,217,036; 3,217,037; 3,400,153; 3,536,760; 3,576,843 and 3,790,560 and Belgium Pat. No. 813,206.

Alicyclic oxime precursors of the formula: ##STR9## used in the preparation of the disulfide compounds of this invention can be prepared by a variety of methods, the choice of method being influenced to a large extent by the types and number of hetero groups included within the alicyclic ring. For example:

A. 2-oximino-1,3,5-trithiane, 4-oximino-1,3-oxazolidin-4-one, 4-oximino-1,3,5-oxadithiane and 2-oximino-1,4-oxazine-3-one compounds can be conveniently prepared by sequentially treating the corresponding 1,3,5-trithiane, 1,3-oxazolidin-4-one, 1,3,5-oxadithiane or 1,4-oxazine-3-one compound with a base and an alkyl nitrite ester followed by neutralization with a suitable organic or inorganic acid. For example, 2-oximino-4-methyltetrahydro-1,4-oxazin-3-one can be prepared by treating 4-methyltetrahydro-1,4-oxazin-3-one with potassium t-butoxide followed by the addition of isobutyl nitrite. The reaction is conducted in anhydrous tetrahydrofuran. After the reaction has gone to completion in about 3 hours the resulting oxime salt is neutralized with hydrochloric acid.

B. 2-Oximino-tetrahydro-1,4-thiazine-3-one compounds can be prepared by reacting ethoxycarbonylformhydroxamoyl chloride with the sodium salt of an appropriately substituted aminoalkane mercaptan in an aprotic solvent, such as benzene, chloroform and the like. This reaction is described in more detail in U.S. Pat. No. 3,790,560.

C. 3-Oximino-1,4-oxathiane and 4-oximino-1,3-oxathiolane compounds can be prepared by sequentially treating bis-(2-bromoalkyl)ether with sodium nitrile and sodium thioacetate to form 2-(2-acetylthioalkoxy)-1-nitroalkane, which is then treated with sodium hydroxide.

D. 4-Oximino-1,3-dithiolane and 2-oximino-1,4-dithiane compounds can be prepared by reacting equivalent amounts of 2-haloalkanehydroxamoyl halide with the sodium salt of an appropriately substituted alkanedithiol in an aprotic solvent like benzene, methylene chloride or ethanol. For example, 2-oximino-3,3-dimethyl-1,4-dithiane can be prepared by adding 1,2-ethanedithiol to sodium ethoxide, thereby producing the sodium salt of 1,2-ethanedithiol in situ and then achieving cyclization by the addition of 2-chloro-2-methylpropionhydroxamoyl chloride.

The hydroxyl aryl compounds employed as reactants in the reaction of METHOD I are well known compounds that can be prepared by well known synthetic procedures or obtained from commercial sources.

The bis-(N-alkyl-N-fluorocarbonylamino) disulfide precursors can be conveniently prepared by reacting sulfur monochloride with N-alkylcarbamoyl fluoride in toluene in the presence of an acid acceptor as for example triethylamine or pyridine. This procedures is described in more detail in U.S. Pat. No. 3,639,471.

The following specific examples are presented to particularly illustrate the invention:

EXAMPLE I Preparation of N-[1-Methylthioacetaldehyde O-(N-methylcarbamoyl) oxime] N-[2,3-Dihydro-2,2-dimethyl-7-benzofuranyl methylcarbamate] disulfide.

To a solution of 1.46 g (0.014 m) of 1-methylthioacetaldoxime and 5.0 g (0.014 m) of 7-[N-methyl-N-(N'-methyl-N'-fluorocarbonylaminothiosulfenyl)carbamoyloxy]-2,3-dihydro-2,2-dimethylbenzofuran in 100 ml of toluene was added with stirring 1.41 g (0.014 m) of triethylamine. The reaction mixture was heated at 50° C. for 24 hours and stirred at ambient temperature for 48 hours. The mixture was then washed with water, dried over magnesium sulfate and concentrated to afford 6.2 g of a glassy amorphous material. Purification by column chromatography afforded 2.7 g of N-[Methylthioacetaldehyde O-(N-methylcarbamoyl)oxime] N-[2,3-Dihydro-2,2-dimethyl-7-benzofuranylmethylcarbamate] disulfide as an amorphous solid.

Calculated for C₁₇ H₂₃ N₃ O₅ S₃ : C, 45.82; H, 5.20; N, 9.43. Found: C, 44.66; H, 5.04; N, 9.06.

EXAMPLE II Preparation of N-[Methyl-4-(O-(N-methylcarbamoyl)oximino)-1,3-oxathiolane] N-[2,3-Dihydro-2,2-dimethyl-7-benzofuranyl methylcarbamate] disulfide.

To a solution of 5.0 g (0.014 m) of 7-[N-methyl-N-(N'-methyl-N'-fluorocarbonylaminothiosulfenyl)carbamoyloxy]-2,3-dihydro-2,2-dimethylbenzofuran and 2.03 g (0.015 m) of 5-methyl-4-oximino-1,3-oxathiolane in 150 ml of toluene was added at ambient temperature with stirring 1.55 g (0.015 m) of triethylamine. The reaction mixture was heated to 70° C. for 5 hours. On cooling it was washed with water, dilute sodium hydroxide solution and again with water until neutral. The organic layer was dried over magnesium sulfate and concentrated to afford 6.44 g of N-[Methyl-4-(O-(N-methylcarbamoyl)oximino)-1,3-oxathiolane] N-[2,3-Dihydro-2,2-dimethyl-7-benzofuranyl methylcarbamate]disulfide as a reddish brown oil, which was purified by column chromatography.

Calculated for C₁₈ H₂₃ N₃ O₆ S₃ : C, 45.65; H, 4.89; N, 8.87. Found: C, 45.20; H, 4.86; N, 8.88.

EXAMPLE III Preparation of N-[2,3-Dihydro-2,2-dimethyl-7-benzofuranyl methylcarbamate] N-[2-cyanoethylthio)acetaldehyde O-(methylcarbamoyl)oxime] disulfide.

To a solution of 4.0 g (0.0277 m) of 1-(2-cyanoethylthio) acetaldoxime and 10.02 g (0.0277 m) of 7-[N-methyl-N-(N'-methyl-N'-fluorocarbonylaminothiosulfenyl)carbamoyloxy]2,3-dihydro-2,2-dimethylbenzofuran in 150 ml of toluene was added with stirring 2.8 g (0.0277 m) of triethylamine. After stirring for 3 days at room temperature the reaction mixture was washed successively with water, dilute sodium hydroxide and water. It was dried over magnesium sulfate and concentrated to an oil. Chromatographic purification afforded 8.31 g of N[2,3-Dihydro-2,2-dimethyl-7-benzofuranyl methylcarbamate] N-[1-(2-cyanoethylthio)acetaldehyde O-(methylcarbamoyl)oxime]disulfide as an oil.

Calculated for C₁₉ H₂₄ N₄ O₅ O₃ : C, 47.09; H, 4.99; N, 11.56. Found: C, 46.65; H, 4.95; N, 11.40.

EXAMPLE IV Preparation of N-[5-methyl-4 O-(N-methylcarbamoyl)oximino-1,3-oxadiolane] N-[4-tert-butylphenylmethylcarbamate] disulfide.

To a solution of 5.0 g (0.014 m) of [N-methyl-N-(N'-methyl-N'-fluorocarbonylaminothiosulfenyl)carbamoyloxy]-4-tert-butyl benzene and 1.86 g (0.014 m) of 5 -methyl-4-oximino-1,3-oxathiolane in 100 ml of toluene was added with stirring 1.42 g (0.014 m) of triethylamine. After stirring for 20 hours at room temperature the reaction mixture was washed with water dried over magnesium sulfate and concentrated to afford 6.52 g of N-[5-methyl-4-O-(N-methylcarbamoyl)oximino-1,3-oxathiolane] N-[4-tert-butylphenyl methylcarbamate] disulfide as an oil, which was purified by dry column chromatography.

Calculated for C₁₈ H₂₅ N₃ O₅ S₃ : C, 47.04; H, 5.48; N, 9.14. Found: C, 47.02; H, 5.50; N, 8.89.

The compounds of Examples V-XI were prepared by the method of Examples I-IV. The physical properties of the compounds of Examples V-XI are set forth in TABLE I below:

                                      TABLE I                                      __________________________________________________________________________     ELEMENTAL ANALYSIS                                                              ##STR10##                                                                                                             ELEMENTAL ANALYSIS                                                             (Calculated/Found)                     EX-                             MOLECULAR      HY-                             AMPLE                                                                               R.sub.1       R.sub.2      WEIGHT  CARBON DROGEN NITROGEN                 __________________________________________________________________________           ##STR11##                                                                                    ##STR12##   C.sub.17 H.sub.25 N.sub.3 O.sub.4                                                      47.31/47.23                                                                           5.84/5.89                                                                             9.74/9.50                VI                                                                                   ##STR13##                                                                                    ##STR14##   C.sub.11 H.sub.18 N.sub.4 O.sub.4                                                      30.68/30.94                                                                           4.21/4.18                                                                             13.01/12.62              VII                                                                                  ##STR15##                                                                                    ##STR16##   C.sub.18 H.sub.24 N.sub.4 O.sub.5                                                      45.74/44.43                                                                           5.12/5.04                                                                             11.86/11.09              VIII                                                                                 ##STR17##                                                                                    ##STR18##   C.sub.12 H.sub.19 N.sub.5 O.sub.4                                                      33.87/33.57                                                                           4.50/4.26                                                                             16.46/15.81              IX                                                                                   ##STR19##                                                                                    ##STR20##   C.sub.13 H.sub.20 N.sub.6 O.sub.6                                                      34.50/34.31                                                                           4.45/4.52                                                                             18.57/18.29              X                                                                                    ##STR21##    C.sub.8 H.sub.17                                                                            C.sub.15 H.sub.29 N.sub.3 O.sub.4                                                      43.77/44.03                                                                           7.10/7.08                                                                             10.21/10.03              XI                                                                                   ##STR22##                                                                                    ##STR23##   C.sub.20 H.sub.26 N.sub.4 O.sub.5                                                      45.26/45.09                                                                           4.94/4.78                                                                             10.56/10.23              __________________________________________________________________________

selected species of the new compounds were evaluated to determine their pesticidal activity against nematodes, mites and certain insects, including an aphid, a caterpillar, a beetle and a fly.

Suspensions of the test compounds were prepared by dissolving one gram of compound in 50 milliliters of acetone in which had been dissolved 0.1 gram (10 percent of the weight of compound) of an alkylphenoxy polyethoxyethanol surfactant, as an emulsifying or dispersing agent. The resulting solution was mixed into 150 milliliters of water to give roughly 200 milliliters of a suspension containing the compound in finely divided form. The thus-prepared stock suspension contained 0.5 percent by weight of compound. The test concentrations in parts per million by weight employed in the tests described hereinbelow were obtained by appropriate dilutions of the stock suspension with water. The test procedures were as follows:

Bean Aphid Foliage Spray Test

Adults and nymphal stages of the bean aphid (Aphis fabae Scop.) reared on potted dwarf nasturtium plants at 65°-70° F. and 50-70 percent relative humidity, constituted the test insects. For testing purposes, the number of aphids per pot was standardized to 100-150 by trimming plants containing excess aphids.

The test compounds were formulated by diluting the stock suspension with water to give a suspension containing 500 parts of test compound per million parts of final formulation.

The potted plants (one pot per compound tested) infested with 100-150 aphids, were placed on a revolving turntable and sprayed with 100-110 milliliters of test compound formulation by use of a DeVilbiss spray gun set at 40 psig. air pressure. This application, which lasted 25 seconds, was sufficient to wet the plants to run-off. As a control, 100-110 milliliters of a water-acetone-emulsifier solution containing no test compound were also sprayed on infested plants. After spraying, the pots were placed on their sides on a sheet of white standard mimeograph paper which had been previously ruled to facilitate counting. Temperature and humidity in the test room during the 24 hour holding period were 65°-70° F. and 50-70 percent, respectively. Aphids which fell onto the paper and were unable to remain standing after being uprighted were considered dead. Aphids remaining on the plants were observed closely for movement and those which were unable to move the length of the body upon stimulation by prodding were considered dead. Percent mortality was recorded for various concentration levels.

Southern Armyworm Leaf Spray Test

Larvae of the southern armyworm (Prodenia eridania, (Cram.)), reared on Tendergreen bean plants at a temperature of 80°±5° F. and a relative humidity of 50±5 percent, constituted the test insects.

The test compounds were formulated by diluting the stock suspension with water to give a suspension containing 500 parts of test compound per million parts of final formulation. Potted Tendergreen bean plants of standard height and age were placed on a revolving turntable and sprayed with 100-110 milliliters of test compound formulation by use of a DeVilbiss spray gun set at 10 psig air pressure. This application, which lasted 25 seconds, was sufficient to wet plants to run-off. As a control, 100-110 milliliters of a water-acetone-emulsifier solution containing no test compound were also sprayed on infested plants. When dry, the paired leaves were separated and each one was placed in a 9 centimeter Petri dish lined with moistened filter paper. Five randomly selected larvae were introduced into each dish and the dishes were closed. The closed dishes were labeled and held at 80°-85° F. for three days. Although the larvae could easily consume the whole leaf within twenty-four hours, no more food was added. Larvae which were unable to move the length of the body, even upon stimulation by prodding, were considered dead. Percent mortality was recorded for various concentration levels.

Mexican Bean Beetle Leaf Spray Test

Fourth instar larvae of the Mexican bean beetle (Epilachna varivestis, Muls.), reared on Tendergreen bean plants at a temperature of 80°±5° F. and 50±5 percent relative humidity, were the test insects.

The test compounds were formulated by diluting the stock suspension with water to give a suspension containing 500 parts of test compound per million parts of final formulation. Potted Tendergreen bean plants of standard height and age were placed on a revolving turntable and sprayed with 100-110 milliliters of test compound formulation by use of a DeVilbiss spray gun set at 10 psig air pressure. This application, which lasted 25 seconds, was sufficient to wet plants to run-off. As a control, 100-110 milliliters of a water-acetone-emulsifier solution containing no test compound were also sprayed on infested plants. When dry, the paired leaves were separated and each was placed in a 9 centimeter Petri dish lined with moistened filter paper. Five randomly selected larvae were introduced into each dish, and the dishes were closed. The closed dishes were labeled and held at a temperature of 80°±5° F. for three days. Although the larvae could easily consume the leaf within 24 to 48 hours, no more food was added. Larvae which were unable to move the length of the body, even upon stimulation, were considered dead.

Fly Bait Test

Four to six day old adult house flies (Musca domestica, L.) reared according to the specifications of the Chemical Specialties Manufacturing Association (Blue Book, McNair-Dorland Co., N.Y. 1954; pages 243-244, 261) under controlled conditions of 80°±5° F. and 50±5 percent relative humidity, were the test insects. The flies were immobilized by anesthetizing with carbon dioxide and twenty five immobilized individuals, males and females, were transferred to a cage consisting of a standard food strainer about five inches in diameter which was inverted over a wrapping-paper-covered surface. The test compounds were formulated by diluting the stock suspension with a 10 percent (by weight) sugar solution to give a suspension containing 500 parts of test compound per million parts of final formulation, by weight. Ten milliliters of the test formulation were added to a souffle cup containing a one-inch square of an absorbent cotton pad. This bait cup was introduced and centered on the blotting paper under the food strainer prior to admitting the anesthetized flies. The caged flies were allowed to feed on the bait for twenty four hours, at a temperature of 80°±5° F. and the relative humdity of 50±5 percent. Flies which showed no sign of movement on prodding were considered dead.

Mite Foliage Spray Test

Adults and nymphal stages of the two-spotted mite (Tetranychus urticae Koch), reared on Tendergreen bean plants at 80±5 percent relative humidity, were the test organisms. Infested leaves from a stock culture were placed on the primary leaves of two bean plants six to eight inches in height, growing in a two-and-a-half inch clay pot. 150-200 Mites, a sufficient number for testing, transferred from the excised leaves to the fresh plants in a period of twenty four hours. Following the twenty four hour transfer period, the excised leaves were removed from the infested plants. The test compounds were formulated by diluting the stock suspension with water to give a suspension containing 500 parts of test compound per million parts of final formulation. The potted plants (one pot per compound) were placed on a revolving turntable and sprayed with 100-110 milliliters of test compound formulation by use of a DeVilbiss spray gun set at 40 psig. air pressure. This application, which lasted 25 seconds, was sufficient to wet the plants to run-off. As a control, 100-110 milliliters of a water solution containing acetone and emulsifier in the same concentrations as the test compound formulation, but containing no test compound, were also sprayed on infested plants. The sprayed plants were held at 80±5 percent relative humidity for six days, after which a mortality count of motile forms was made. Microscopic examination for motile forms was made on the leaves of the test plants. Any individual which was capable of locomotion upon prodding was considered living.

The results of these tests are set forth in TABLE II below. In these tests the pesticidal activity of the compounds against aphid, mite, South Armyworm, Bean Beetle and housefly was rated as follows:

A=excellent control

B=partial control

C=no control

POST-EMERGENT HERBICIDAL TEST

Experiments were also conducted to determine the phytotoxicity of representative compositions with respect to healthy fresh plants. Solutions of the compounds were prepared as described above to provide a concentration of 2500 parts per million of the test compound. The test plants were sprayed in accordance with the procedure described above for the Mite Foliage Spray Test so as to deliver approximately 100 milliliters of test solution to the leaves of each plant tested. The sprayed plants and controls were set aside for approximately one hour to allow the solutions to dry and were then placed in the greenhouse. After ten days the plants were visually inspected to determine the extent of foliage injury. A rating of 1 indicates no perceptible injury; 5 indicates the plant was dead and ratings of 2, 3 and 4 indicate intermediate degrees of injury based upon the number and extent to which leaves were injured.

The results of these experiments are summarized and set forth in Table II, below.

                                      TABLE II                                     __________________________________________________________________________      ##STR24##                                                                                               BIOLOGICAL ACTIVITY                                                            INSECTICIDAL                                                                   AND MITICIDAL                                                                         Southern                                                                            Mexican  PHYTOTOXICITY                                                    Army-                                                                               Bean House-    To-                                                                               Cot-                                                                               Soy-               R.sub.1       R.sub.2     Aphid                                                                              Mite                                                                              worm Beetle                                                                              fly Bean                                                                              Corn                                                                              mato                                                                              ton bean               __________________________________________________________________________      ##STR25##                                                                                    ##STR26##  A   B  A    A    A   1  1  1  2   2                   ##STR27##                                                                                    ##STR28##  A   A  A    A    A   1  1  1  1   2                   ##STR29##                                                                                    ##STR30##  A   A  A    A    A   1  1  1  1   1                   ##STR31##                                                                                    ##STR32##  A   A  A    A    A   1  1  1  1   1                   ##STR33##                                                                                    ##STR34##  A   B  A    A    A   1  1  1  1   2                   ##STR35##                                                                                    ##STR36##  A   C  A    A    A   1  1  2  2   1                   ##STR37##                                                                                    ##STR38##  A   A  A    A    A   1  1  2  2   2                   ##STR39##                                                                                    ##STR40##  A   A  A    A    A   1  1  1  1   2                   ##STR41##                                                                                    ##STR42##  A   A  A    A    A   1  1  1  2   2                  C.sub.8 H.sub.17                                                                              ##STR43##  A   A  A    A    A   2  1  1  3   2                   ##STR44##                                                                                    ##STR45##  A   A  A    A    A   1  1  1  1   1                  __________________________________________________________________________

the results set forth in TABLE I clearly show the broad spectrum pesticidal activity of the compounds of this invention, as well as their reduced phylotoxicity. It will be understood that the insect and mite representative of a wide variety of pests that can be controlled through the use of the compounds of this invention.

The compounds contemplated in this invention may be applied as insecticides and miticides according to methods known to those skilled in the art. Pesticidal compositions containing the compounds as the active toxicant will usually comprise a carrier and/or diluent, either liquid or solid.

Suitable liquid diluents or carriers include water, petroleum distillates, or other liquid carriers with or without surface active agents. Liquid concentrates may be prepared by dissolving one of these compounds with a non phytotoxic solvent such as acetone, xylene or nitrobenzene and dispersing the toxicants in water with the acid of suitable surface active emulsifying and dispersing agents.

The choice of dispersing and emulsifying agents and the amount employed is dictated by the nature of the composition and the ability of the agent to facilitate the dispersion of the toxicant. Generally, it is desirable to use as little of the agent as is possible, consistent with the desired dispersion of the toxicant in the spray so that rain does not re-emulsify the toxicant after it is applied to the plant and wash it off the plant. Nonionic, anionic, amphoteric, or cationic dispersing and emulsifying agents may be employed, for example, the condensation products of alkylene oxides with phenol and organic acids, alkyl aryl sulfonates, complex ether alcohols, quaternary ammonium compounds, and the like.

In the preparation of wettable powder or dust or granulated compositions, the active ingredient is dispersed in and on an appropriately divided solid carrier such as clay, talc, bentonite, diatomaceous earth, fullers earth, and the like. In the formulation of the wettable powders the aforementioned dispersing agents as well as lignosulfonates can be included.

The required amount of the toxicants contemplated herein may be applied per acre treated in from 1 to 200 gallons or more of liquid carrier and/or diluent or in from about 5 to 500 pounds of inert solid carrier and/or diluent. The concentration in the liquid concentrate will usually vary from about 10 to 95 percent by weight and in the solid formulations from about 0.5 to about 90 percent by weight. Satisfactory sprays, dusts, or granules for general use contain from about 1/4 to 15 pound of active toxicant per acre.

The pesticides contemplated herein prevent attack by insects, nematodes and mites upon plants or other material to which the pesticides are applied, and they have relatively high residual toxicity. With respect to plants, they have a high margin of safety in that when used in sufficient amount to kill or repel the insects, they do not burn or injure the plant, and they resist weathering which includes wash-off caused by rain, decomposition by ultra-violet light, oxidation, or hydrolysis in the presence of moisture or, at least such decomposition, oxidation, and hydrolysis as would materially decrease the desirable pesticidal characeristic of the toxicants or impart undesirable characteristics, for instance, phytotoxicity, to the toxicants. The toxicants are so chemically inert that they are compatible with substantially any other constituents of the spray schedule, and they may be used in the soil, upon the seeds, or the roots of plants without injuring either the seeds or roots of plants. They may also be used in combination with other pesticidally active compounds. 

What is claimed is:
 1. A compound of the formula: ##STR46## wherein: R' and R" are the same and are alkyl having from 1 to 4 carbon atoms;R₁ is alkynyl, ##STR47## R₂ is other than R₁ and is: (A) alkyl, alkenyl or alkynyl; or(B) dihydrobenzofuranyl, naphthyl, tetrahydronaphthyl, benzothienyl, benzodioxalanyl, benzofuranyl, benzodioxanyl all of which may be substituted with one or more alkyl groups; or (C) either substituted or unsubstituted phenyl wherein the permissible substituents are one or more halo, cyano, nitro, cycloalkyl, alkyl, alkylthio, alkynyl, alkenyl, alkylsulfinyl, alkylsulfonyl, alkylthioalkyl, alkylsulfinylalkyl, alkylsulfonylalkyl, amino, alkynylthio, alkenylthio, alkylamino, dialkylamino, alkoxycarbonylamino, trihalomethyl, dialkylaminoalkyleneamino, formamidino, alkoxy, dicyanoethenylene, alkynyloxy, phenoxy, phenyl, 2-oxathianyl, 2-oxathiolanyl, 2-dithianyl, 2-dithiolanyl or 2-dioxalanyl; or ##STR48## wherein: R₃ is hydrogen, alkyl, alkylthio, alkylsulfinyl, alkylsulfonyl or cyano; R₄ is alkyl, alkylthio, alkylsulfinyl, alkylsulfonyl, alkoxy, alkanoyl, aroyl, alkoxycarbonyl, phenyl, aminocarbonyl, alkylaminocarbonyl or dialkylaminocarbonyl, all of which may be unsubstituted or, except aminocarbonyl, substituted with one or more cyano, nitro, alkylthio, alkylsulfinyl, alkylsulfonyl, alkoxy, aminocarbonyl, alkylaminocarbonyl, dialkylaminocarbonyl or R₄ is a ##STR49## where R₅ is hydrogen, alkyl or alkoxy; A is a divalent alkylene chain having from 2 to 24 aliphatic carbon atoms completing a five or six membered ring structure which includes one, two or three groups selected from the group consisting of divalent oxygen, sulfur, sulfinyl, sulfonyl, amino, alkylamino, alkylimino or carbonyl groups; with the proviso that R₂, R₃, R₄ and R₅ substituents individually may not include more than eight aliphatic carbon atoms.
 2. A compound according to claim 1 wherein R' and R" are methyl.
 3. A compound according to claim 1 wherein R₁ is ##STR50##
 4. A compound according to claim 3 wherein:R₃ is hydrogen, alkyl, alkylthio or cyano; R₄ is alkyl, nitroalkyl, alkylthio, alkylsulfinyl, alkylsulfonyl, alkylthioalkyl, alkylsulfinylalkyl, alkylsulfonylalkyl, cyanoalkylthio or cyanoalkyl.
 5. A compound according to claim 3 wherein R₂ is ##STR51##
 6. A compound according to claim 3 wherein A is a divalent alkylene chain having from 2 to 24 aliphatic carbon atoms completing a 2-oximino-1,4-dithiane, 2-oximino-1,3-dithiane, 4-oximino-1,3-dithiolane, 2-oximino-1,4-dioxane, 2-oximino-tetrahydro-1,4-thiazine-3-one, 2-oximino-1,3-dithiolane, 2-imino-4-oximino-1,3-dithiolane, 3-oximino-thiophane, 2-oximinothiophane, 2-oximinotetrahydro-1,4-oxazin-3-one, 2-oximino-1,3,5-trithiane, 4-oximino-1,3,5-oxadithiane, 2-oximino-1,4-oxathiane, 4-oximino-1,3-oxathiolane, 2-oximino-thiazolidin-3-one, 2-oximino-1,3-thiazolidin-4-one, or 2-oximino-tetrahydro-1,4-thiazine-5-one ring structure, wherein sulfur may be in any of its oxidation states.
 7. A compound according to claim 3 wherein R₂ is alkyl, alkenyl, alkynyl, naphthyl, dihydrobenzofuranyl, either unsubstituted or substituted with one or more alkyl, phenyl or phenyl substituted with one or more alkyl, dialkylamino, alkoxycarbonylamino, dialkylamino-alkyleneimino, alkoxy, alkynyloxy, alkylthio or halo.
 8. A compound according to claim 3 wherein R₂ is ##STR52##
 9. A compound according to claim 8 wherein A is a divalent alkylene chain having from 2 to 24 aliphatic carbon atoms completing a 2-oximino-1,4-dithiane, 2-oximino-1,3-dithiane, 4-oximino-1,3-dithiolane, 2-oximino-1,4-dioxane, 2-oximino-tetrahydro-1,4-thiazine-3-one, 2-oximino-1,3-dithiolane, 2-imino-4-oximino-1,3-dithiolane, 3-oximinothiophane, 2-oximinothiophane, 2-oximino-tetrahydro-1,4-oxazin-3-one, 2-oximino-1,3,5-trithiane, 4-oximino-1,3,5-oradithiane, 2-oximino-1,4-orathiane, 4-oximino-1,3-oxathiolane, 2-oximino-thiazolidin-3-one, 2-oximino-1,3-thiazolidin-4-one or 2-oximino-tetrahydro-1,4-thiazine-5-one ring structure, wherein sulfur may be in any of its oxidation states.
 10. A compound according to claim 9 wherein:R₃ is hydrogen, alkyl, alkylthio; R₄ is alkyl, nitroalkyl, alkylthio, alkylsulfinyl, alkylsulfonyl, alkylthioalkyl, alkylsulfinylalkyl, alkylsulfonylalkyl, cyanoalkylthio or cyanoalkyl.
 11. A compound according to claim 1 wherein:R' and R" are methyl; R₁ is ##STR53## R₂ is other than R₁ and is alkyl, alkenyl, alkynyl, naphthyl, phenyl dihydrobenzofuranyl either unsubstituted or substituted with one or more alkyl, or phenyl either substituted or unsubstituted with one or more alkyl, dialkylamino, alkoxycarbonylamino, dialkylaminoalkyleneimino, alkoxy, alkynyloxy, alkylthio or halo; or R₂ is ##STR54## wherein: R₃ is hydrogen, alkyl, alkylthio or cyano; R₄ is alkyl, nitroalkyl, alkylthio, alkylsulfinyl, alkylsulfonyl, alkylthioalkyl, alkylsulfinylalkyl, alkylsulfonylalkyl, cyanoalkylthio or cyanoalkyl; A is a divalent alkylene chain having from 2 to 24 aliphatic carbon atoms completing a 2-oximino-1,4-dithiane, 2-oximino-1,3-dithiane, 4-oximino-1,3-dithiolane, 2-oximino-1,4-dioxane, 2-oximino-tetrahydro-1,4-thiazine-3-one, 2-oximino-1,3-dithiolane, 2-imino-4-oximino-1,3-dithiolane, 3-oximinothiophane, 2-oximinothiophane, 2-oximino-tetrahydro-1,4-oxazin-3-one, 2-oximino-1,3,5-trithiane, 4-oximino-1,3,5-oxadithiane, 2-oximino-1,4-oxathiane, 4-oximino-1,3-oxathiolane, 2-oximino-thiazolidin-3-one, 2-oximino-1,3-thiozolidin-4-one or 2-oximino-tetrahydro-1,4-thiazine-5-one ring structure, wherein sulfur may be in any of its oxidation states.
 12. N-[1-Methylthioacetaldehyde O-(N-methylcarbamoyl)oxime] N-[2,3-Dihydro-2,2-dimethyl-7-benzofuranylmethylcarbamate] disulfide.
 13. N-[2,3-Dihydro-2,2-dimethyl-7-benzofuranylmethylcarbamate] N-[1-(2-cyanoethylthio)acetaldehyde O-(methylcarbamoyl)oxime] disulfide.
 14. N-[1-Methylthioacetaldehyde O-(N-methylcarbamoyl)oxime] N-[2-O-(N-methylcarbamoyl)oximino-1,4-dithiane]disulfide.
 15. A insecticidal, miticidal and nematocidal composition comprising an acceptable carrier and as the active toxicant and insecticidally, miticidally or nematocidally effective amount of a compound of the formula: ##STR55## wherein: R' and R" are the same and are alkyl having from 1 to 4 carbon atoms;R₁ is alkynyl, ##STR56## R₂ is other than R₁ and is: (A) alkyl, alkenyl or alkynyl; or(B) dihydrobenzofuranyl, naphthyl, tetrahydronaphthyl, benzothienyl, benzodioxalanyl, benzofuranyl, benzodioxanyl or methylenedioxyphenyl all of which may be substituted with one or more alkyl groups; or (C) either substitute or unsubstituted phenyl wherein the permissible substituents are one or more halo, cyano, nitro, cycloalkyl, alkyl, alkylthio, alkynyl, alkenyl, alkylsulfinyl, alkylsulfonyl, alkylthioalkyl, alkylsulfinylalkyl, alkylsulfonylalkyl, amino, alkynylthio, alkenylthio, alkylamino, dialkylamino, alkoxycarbonylamino, trihalomethyl, dialkylaminoalkyleneamino, formamidino, alkoxy, dicyanoethenylene, alkynyloxy, phenoxy, phenyl, 2-oxathianyl, 2-oxathiolanyl, 2-dithianyl, 2-dithiolanyl or 2-dioxalanyl; or ##STR57## wherein: R₃ is hydrogen, alkyl, alkylthio, alkylsulfinyl, alkylsulfonyl or cyano; R₄ is alkyl, alkylthio, alkylsulfinyl, alkylsulfonyl, alkoxy, alkanoyl, aroyl, alkoxycarbonyl, phenyl, aminocarbonyl, alkylaminocarbonyl or dialkylaminocarbonyl, all of which may be unsubstituted or, except aminocarbonyl, substituted with one or more cyano, nitro, alkylthio, alkylsulfinyl, alkylsulfonyl, alkoxy, aminocarbonyl, alkylaminocarbonyl, dialkylaminocarbonyl or R₄ is a ##STR58## where R₅ is hydrogen, alkyl or alkoxy; A is a divalent alkylene chain having from 2 to 24 aliphatic carbon atoms completing a five or six membered ring structure which includes one, two or three groups selected from the group consisting of divalent oxygen, sulfur, sulfinyl, sulfonyl, amino, alkylamino, alkylimino or carbonyl groups;
 16. A composition according to claim 15 wherein R' and R" are methyl.
 17. A composition according to claim 15 wherein R₁ is ##STR59##
 18. A composition according to claim 17 whereinR₃ is hydrogen, alkyl, alkylthio or cyano; R₄ is alkyl, nitroalkyl, alkylthio, alkylsulfinyl, alkylsulfonyl, alkylthioalkyl, alkylsulfinylalkyl, alkylsulfonylalkyl, cyanoalkylthio or cyanoalkyl.
 19. A composition according to claim 15 wherein R₂ is ##STR60##
 20. A composition according to claim 17 wherein A is a divalent alkylene chain having from 2 to 24 aliphatic carbon atoms completing a 2-oximino-1,4-dithiane, 2-oximino-1,3-dithiane, 4-oximino-1,3-dithiolane, 2-oximino-1,4-dioxane, 2-oximino-tetrahydro-1,4-thiazine-3-one, 2-oximino-1,3-dithiolane, 2-imino-4-oximino-1,3-dithiolane, 2-oximinothiophane, 2-oximinothiophane, 2-oximinotetrahydro-1,4-oxazin-3-one, 2-oximino-1,3,5-trithiane, 4-oximino-1,3,5-oxadithiane, 2-oximino-1,4-oxathiane, 4-oximino-1,3-oxathiolane, 2-oximino-thiazolidin-3-one, 3-oximino-1,3-thiazolidin-4-one, or 2-oximino-tetrahydro-1,4-thiazine-5-one ring structure, wherein sulfur may be in any of its oxidation states.
 21. A composition according to claim 17 wherein R₂ is alkyl, alkenyl, alkynyl, naphthyl, dihydrobenzofuranyl either unsubstituted or substituted with one or more alkyl, phenyl or phenyl substituted with one or more alkyl, dialkylamino, alkoxycarbonylamino, dialkylaminoalkyleneimino, alkoxy, alkynyloxy, alkylthio or halo.
 22. A composition according to claim 17 wherein R₂ is ##STR61##
 23. A composition according to claim 22 wherein A is a divalent alkylene chain having from 2 to 24 aliphatic carbon atoms completing a 2-oximino-1,4-dithiane, 2-oximino-1,3-dithiane, 4-oximino-1,3-dithiolane, 2-oximino-1,4-dioxane, 2-oximino-tetrahydro-1,4-thiazine-3-one, 2-oximino-1,3-dithiolane, 2-imino-4-oximino-1,3-dithiolane, 3-oximinothiophane, 2-oximinothiophane, 2-oximino-tetrahydro-1,4-oxazin-3-one, 2-oximino-1,3,5-trithiane, 4-oximino-1,3,5-oxadithiane, 2-oximino-1,4-oxathiane, 4-oximino-1,3-oxathiolane, 2-oximino-thiazolidin-3-one, 2-oximino-1,3-thiazolidin-4-one or 2-oximino-tetrahydro-1,4-thiazine-5-one ring structure, wherein sulfur may be in any of its oxidation states.
 24. A composition according to claim 23 wherein:R₃ is hydrogen, alkyl, alkylthio; R₄ is alkyl, nitroalkyl, alkylthio, alkylsulfinyl, alkylsulfonyl, alkylthioalkyl, alkylsulfinylalkyl, alkylsulfonylalkyl, cyanoalkylthio or cyanoalkyl.
 25. A composition according to claim 15 wherein:R' and R" are methyl; R₁ is ##STR62## R₂ is other than R₁ and is alkyl, alkenyl, alkynyl, naphthyl, dihydrobenzofuranyl either unsubstituted or substituted with one or more alkyl, or phenyl ether substituted or unsubstituted with one or more alkyl, dialkylamino, alkoxycarbonylamino, dialkylaminoalkyleneimino, alkoxy, alkynyloxy, alkylthio or halo; or R₂ is ##STR63## wherein: R₃ is hydrogen, alkyl, alkylthio or cyano; R₄ is alkyl, nitroalkyl, alkylthio, alkylsulfinyl, alkylsulfonyl, alkylthioalkyl, alkylsulfinylalkyl, alkylsulfonylalkyl, cyanoalkylthio or cyanoalkyl; A is a divalent alkylene chain having from 2 to 24 aliphatic carbon atoms completing a 2-oximino-1,4-dithiane, 2-oximino-1,3-dithiane, 4-oximino-1,3-dithiolane, 2-oximino-1,4-dioxane, 2-oximino-tetrahydro-1,4-thiazine-3-one, 2-oximino-1,3-dithiolane, 2-imino-4-oximino-1,3-dithiolane, 3-oximinothiophane, 2-oximino-thiophane, 2-oximino-tetrahydro-1,4-oxazin-3-one, 2-oximino-1,3,5-trithiane, 4-oximino-1,3,5-oxadithiane, 2-oximino-1,4-oxathiane, 4-oximino-1,3-oxathiolane, 2-oximino-thiazolidin-3-one, 2-oximino-1,3-thiozolidin-4-one or 2-oximino-tetrahydro-1,4-thiazine-5-one ring structure, wherein sulfur may be in any of its oxidation states.
 26. A composition according to claim 15 wherein the active toxicant is N-[1-Methylthioacetaldehyde O-(N-methylcarbamoyl)oxime] N-[2-O-(N-methylcarbamoyl) oximino-1,4-dithiane] disulfide.
 27. A method of controlling, nematodes, insects and mites which comprises subjecting them to a nematocidally, insecticidally or miticidally effective amount of a compound of the formula: ##STR64## wherein: R' and R" are the same and are alkyl having from 1 to 4 carbon atoms;R₁ is alkynyl, ##STR65## R₂ is other than R₁ and is: (A) alkyl, alkenyl or alkynyl; or(B) dihydrobenzofuranyl, naphthyl, tetrahydronaphthyl, benzothienyl, benzodioxalanyl, benzofuranyl, benzodioxanyl all of which may be substituted with one or more alkyl groups; or (C) either substituted or unsubstituted phenyl wherein the permissible substituents are one or more halo, cyano, nitro, cycloalkyl, alkyl, alkylthio, alkynyl, alkenyl, alkylsulfinyl, alkylsulfonyl, alkylthioalkyl, alkylsulfinylalkyl, alkylsulfonylalkyl, amino, alkynylthio, alkenylthio, alkylamino, dialkylamino, alkoxycarbonylamino, trihalomethyl, dialkylaminoalkyleneamino, formamidino, alkoxy, dicyanoethenylene, alkynyloxy, phenoxy, phenyl, 2-oxathianyl, 2-oxathiolanyl, 2-dithianyl, 2-dithiolanyl or 2-dioxalanyl; or ##STR66## wherein: R₃ is hydrogen, alkyl, alkylthio, alkylsulfinyl, alkylsulfonyl or cyano; R₄ is alkyl, alkylthio, alkylsulfinyl, alkylsulfonyl, alkoxy, alkanoyl, aroyl, alkoxycarbonyl, phenyl, aminocarbonyl, alkylaminocarbonyl or dialkylaminocarbonyl, all of which may be unsubstituted or, except aminocarbonyl, substituted with one or more cyano, nitro, alkylthio, alkylsulfinyl, alkylsulfonyl, alkoxy, aminocarbonyl, alkylaminocarbonyl, dialkylaminocarbonyl or R₄ is a ##STR67## where R₅ is hydrogen, alkyl or alkoxy; A is a divalent alkylene chain having from 2 to 24 aliphatic carbon atoms completing a five or six membered ring structure which includes one, two or three groups selected from the group consisting of divalent oxygen, sulfur, sulfinyl, sulfonyl, amino, alkylamino, alkylimino or carbonyl groups; with the proviso that R₂, R₃, R₄ and R₅ substituents individually may not include more than eight aliphatic carbon atoms.
 28. A method according to claim 27 wherein R' and R" are methyl.
 29. A method according to claim 27 wherein R₁ is ##STR68##
 30. A method according to claim 29 wherein:R₃ is hydrogen, alkyl, alkylthio or cyano; R₄ is alkyl, nitroalkyl, alkylthio, alkylsulfinyl, alkylsulfonyl, alkylthioalkyl, alkylsulfinylalkyl, alkylsulfonylalkyl, cyanoalkylthio or cyanoalkyl.
 31. A method according to claim 27 wherein R₂ is ##STR69##
 32. A method according to claim 29 wherein A is a divalent alkylene chain having from 2 to 24 aliphatic carbon atoms completing a 2-oximino-1,4-dithiane, 2-oximino-1,3-dithiane, 4-oximino-1,3-dithiolane, 2-oximino-1,4-dioxane, 2-oximino-tetrahydro-1,4-thiazine-3-one, 2-oximino-1,3-dithiolane, 2-imino-4-oximino-1,3-dithiolane, 3-oximino-thiophane, 2-oximinothiophane, 2-oximino-tetrahydro-1,4-oxazin-3-one, 2-oximino-1,3,5-trithiane, 4-oximino-1,3,5-oxadithiane, 2-oximino-1,4-oxathiane, 4-oximino-1,3-oxathiolane, 2-oximino-thiazolidin-3-one, 2-oximino-1,3-thiazolidin-4-one, or 2-oximino-tetrahydro-1,4-thiazine-5-one ring structure, wherein sulfur may be in any of its oxidation states.
 33. A method according to claim 29 wherein R₂ is alkyl, alkenyl, alkynyl, naphthyl, dihydrobenzofuranyl either unsubstituted or substituted with one or more alkyl, phenyl or phenyl substituted with one or more alkyl, dialkylamino, alkoxycarbonylamino, dialkylamino-alkyleneimino, alkoxy, alkynyloxy, alkylthio or halo.
 34. A method according to claim 29 wherein R₂ is ##STR70##
 35. A method according to claim 34 wherein A is a divalent alkylene chain having from 2 to 24 aliphatic carbon atoms completing a 2-oximino-1,4-dithiane, 2-oximino-1,3-dithiane, 4-oximino-1,3-dithiolane, 2-oximino-1,4-dioxane, 2-oximino-tetrahydro-1,4-thiazine-3-one, 2-oximino-1,3-dithiolane, 2-imino-4-oximino-1,3-dithiolane, 3-oximino-thiophane, 2-oximinothiophane, 2-oximino-tetrahydro-1,4-oxazin-3-one, 2-oximino-1,3,5-trithiane, 4-oximino-1,3,5-oxadithiane, 2-oximino-1,4-orathiane, 4-oximino-1,3,-oxathiolane, 2-oximino-thiazolidin-3-one, 2-oximino-1,3-thiazolidin-4-one or 2-oximino-tetrahydro-1,4-thiazine-5-one ring structure, wherein sulfur may be in any of its oxidation states.
 36. A method according to claim 35 wherein:R₃ is hydrogen, alkyl, alkylthio; R₄ is alkyl, nitroalkyl, alkylthio, alkylsulfinyl, alkylsulfonyl, alkylthioalkyl, alkylsulfinylalkyl, alkylsulfonylalkyl, cyanoalkylthio or cyanoalkyl.
 37. A method according to claim 27 wherein:R' and R" are methyl; R₁ is ##STR71## R₂ is other than R₁ and is alkyl, alkenyl, alkynyl, naphthyl, phenyl dihydrobenzofuranyl either unsubstituted or substituted with one or more alkyl, or phenyl either substituted or unsubstituted with one or more alkyl, dialkylamino, alkoxycarbonylamino, dialkylaminoalkyleneimino, alkoxy, alkynyloxy, alkylthio or halo; or R₂ is ##STR72## wherein: R₃ is hydrogen, alkyl, alkylthio or cyano; R₄ is alkyl, nitroalkyl, alkylthio, alkylsulfinyl, alkylsulfonyl, alkylthioalkyl, alkylsulfinylalkyl, alkylsulfonylalkyl, cyanoalkylthio or cyanoalkyl; A is a divalent alkylene chain having from 2 to 24 aliphatic carbon atoms completing a 2-oximino-1,4-dithiane, 2-oximino-1,3-dithiane, 4-oximino-1,3-dithiolane, 2-oximino-1,4-dioxane, 2-oximino-tetrahydro-1,4-thiazine-3-one, 2-oximino-1,3-dithiolane, 2-imino-4-oximino-1,3-dithiolane, 3-oximinothiophane, 2-oximino-thiophane, 2-oximino-tetrahydro-1,4-oxazin-3-one, 2-oximino-1,3,5-trithiane, 4-oximino-1,3,5-oxadithiane, 2-oximino-1,4-oxathiane, 4-oximino-1,3-oxathiolane, 2-oximino-thiazolidin-3-one, 2-oximino-1,3-thiozolidin-4-one or 2-oximino-tetrahydro-1,4-thiazine-5-one ring structure, wherein sulfur may be in any of its oxidation states.
 38. A method according to claim 27 wherein N-[1-Methylthioacetaldehyde O-(N-methylcarbamoyl)oxime] N-[2-O-(N-methylcarbamoyl)oximino-1,4-dithiane] disulfide.
 39. A compound of the formula: ##STR73## wherein: R' and R" are the same and are alkyl having from 1 to 4 carbon atoms;R₁ is ##STR74## wherein: R₃ is hydrogen, alkyl, alkylthio, alkylsulfinyl, alkylsulfonyl or cyano; R₄ is alkyl, alkylthio, alkylsulfinyl, alkylsulfonyl, alkoxy, alkanoyl, aroyl, alkoxycarbonyl, phenyl, aminocarbonyl, alkylaminocarbonyl, or dialkylaminocarbonyl, all of which may be unsubstituted or, except aminocarbonyl, substituted with one or more cyano, nitro, alkylthio, alkylsulfinyl, alkylsulfonyl alkoxy, aminocarbonyl, alkylaminocarbonyl, dialkylaminocarbonyl or R₄ is a ##STR75## where R₅ is hydrogen, alkyl or alkoxy; R₂ is dihydrobenzofuranyl, benzothienyl, benzodioxalaryl, benzofuranyl or benzodioxanyl, all of which may be either unsubstituted or substituted with one or more alkyl groups: With the proviso that R₂, R₃, R₄ and R₅ substitutents individually may not include more than eight aliphatic carbon atoms.
 40. A compound according to claim 39 wherein R' and R" are methyl.
 41. A compound according to claim 39 wherein:R³ is hydrogen, alkyl, alkylthio or cyano; R⁴ is alkyl, nitroalkyl, alkylthio, alkylsulfinyl, alkylsulfinylalkyl, alkylsulfonylalkyl, cyanoalkylthio or cyanoalkyl.
 42. A compound according to claim 39 wherein R² is dihydrobenzofuranyl either unsubstituted or substituted with one or more alkyl groups.
 43. An insecticidal, miticidal and nematocidal composition comprising an acceptable carrier and or the active toxicant an insecticidally, miticidally or nematocidally effective amount of a compound according to claim
 39. 44. An insecticidal, miticidal and nematocidal composition comprising an acceptable carrier and or the active toxicant an insecticidally, miticidally or nematocidally effective amount of a compound according to claim
 40. 45. An insecticidal, miticidal and nematocidal composition comprising an acceptable carrier and or the active toxicant an insecticidally, miticidally or nematocidally effective amount of a compound according to claim
 41. 46. An insecticidal, miticidal and nematocidal composition comprising an acceptable carrier and or the active toxicant an insecticidally, miticidally or nematocidally effective amount of a compound according to claim
 42. 47. A composition according to claim 46 wherein the active toxicant is N-[1-Methylthioacetaldehyde O-(N-methylcarbamoyl)oxime] N-[2,3-Dihydro-2,2-dimethyl-7-benzofuranylmethylcarbamate] disulfide.
 48. A composition according to claim 46 wherein the active toxicant is N-[2,3-Dihydro-2,2-dimethyl-7-benzofuranylmethylcarbamate] N-[1-(2-cyanoethylthio) acetaldehyde O-(methylcarbamoyl)oxime] disulfide.
 49. A method of controlling insects, mites and nematodes which comprises subjecting them to an insecticidally, miticidally or nematocidally effective amount of a compound according to claim
 39. 50. A method of controlling insects, mites and nematodes which comprises subjecting them to an insecticidally, miticidally or nematocidally effective amount of a compound according to claim
 40. 51. A method of controlling insects, mites and nematodes which comprises subjecting them to an insecticidally, miticidally or nematocidally effective amount of a compound according to claim
 41. 52. A method of controlling insects, mites and nematodes which comprises subjecting them to an insecticidally, miticidally or nematocidally effective amount of a compound according to claim
 42. 53. A method according to claim 52 wherein the compound is N-[1-Methylthioacetaldehyde O-(N-methylcarbamoyl)oxime] N-[2,3-Dihydro-2,2-dimethyl-7-benzofuranylmethylcarbamate] disulfide.
 54. A method according to claim 52 wherein N-[2,3-Dihydro-2,2-dimethyl-7-benzofuranylmethylcarbamate] N-[1-(2-cyanoethylthio)acetaldehyde O-(methylcarbamoyl) oxime] disulfide. 